(49.14*5^2+937.5x)/(147.42*5+1875)*(24.57*5^2+312.5*5)-1.2*(6.25*5^2+610.32*5)/(37.5*5+1220.64)*(12.5*5^2+610.32*5)+117.95*5-929.47>0
    (49.14x^2+937.5x)/(147.42x+1875)*(24.57x^2+312.5x)-1.2*(6.25x^2+610.32x)/(37.5x+1220.64)*(12.5x^2+610.32x)-117.95x-929.47>0
    (49.14x^2+937.5x)/(147.42x+1875)*(24.57x^2+312.5x)-1.2*(6.25x^2+610.32x)/(37.5x+1220.64)*(12.5x^2+610.32x)+117.95x-929.47>0
    -0.01x^2+2x-1≥55
    （x-2）÷5-（x+4）÷2＞-3
    4/5(380－x)+x≤400×85%
    108.33*x+9.665*x^2>316+63.2*x
    30.456*n*n*n/6+801.498*n*n/6-642.7988*n-6261.392344>0
    146.98×10^6≤13585000x-7150x^2
    146.98×10^6≤715000x-1430x^2
    872.47×10^6≤13585000x-7150x^2
    872.47×10^6≤715000x-1430x^2
    2(5/4)^x+5(4/5)^x>7
    -x/(1+3%)*3%=66.37
    3-6x+x∧2+19<0
    3-6x+x∧2<0
    x∧2-4x+3≥0
    abs（x-2）<3
    -X＞-1
    ((1+sinx)/((1-sinx)-1)/(2*sqrt((1+sinx)/(1-sinx)))>tanx

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